8720784 has 60 divisors (see below), whose sum is σ = 25321296. Its totient is φ = 2905632.

The previous prime is 8720783. The next prime is 8720797. The reversal of 8720784 is 4870278.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8720783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2767 + ... + 5009.

Almost surely, 2^8720784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8720784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12660648).

8720784 is an abundant number, since it is smaller than the sum of its proper divisors (16600512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8720784 is a wasteful number, since it uses less digits than its factorization.

8720784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 8720784 is about 2953.0973570135. The cubic root of 8720784 is about 205.8346616898.

The spelling of 8720784 in words is "eight million, seven hundred twenty thousand, seven hundred eighty-four".